bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217 building syzkaller on 4a77ae0bdc5cd75ebe88ce7c896aae6bbf457a29 testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.4.1 20210217 kernel signature: e8d712c729701dc93e771062207cfab4b167b4c7de145364395790657337bf11 all runs: crashed: INFO: task hung in __sync_dirty_buffer testing current HEAD 255b58a2b3af0baa0ee11507390349217b8b73b0 testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217 kernel signature: 314eb553c1777a34ea6f59c756af2dce3703e7e2d4b54e32cf83af8adb9a38d8 all runs: crashed: INFO: task hung in __sync_dirty_buffer revisions tested: 2, total time: 30m48.152471078s (build: 16m2.74846919s, test: 13m50.056531383s) the crash still happens on HEAD commit msg: Linux 4.19.176 crash: INFO: task hung in __sync_dirty_buffer Bluetooth: hci0: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout INFO: task syz-executor.4:7419 blocked for more than 140 seconds. Not tainted 4.19.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25480 7419 5919 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5181 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xbb/0x160 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xde/0x110 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x3c/0x40 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x180/0x1f0 fs/buffer.c:3178 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3204 __ext4_handle_dirty_metadata+0x17a/0x520 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4f8/0xc40 fs/ext4/inline.c:1240 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4960 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308 ksys_fallocate+0x3c/0x80 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x92/0xf0 fs/open.c:337 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465849 Code: Bad RIP value. RSP: 002b:00007fb2becaf188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465849 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004af675 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffe0 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffd3f96a55f R14: 00007fb2becaf300 R15: 0000000000022000 INFO: task syz-executor.5:7431 blocked for more than 140 seconds. Not tainted 4.19.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D25656 7431 5921 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5181 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xbb/0x160 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xde/0x110 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x3c/0x40 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x180/0x1f0 fs/buffer.c:3178 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3204 __ext4_handle_dirty_metadata+0x17a/0x520 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4f8/0xc40 fs/ext4/inline.c:1240 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4960 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308 ksys_fallocate+0x3c/0x80 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x92/0xf0 fs/open.c:337 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465849 Code: Bad RIP value. RSP: 002b:00007fa874405188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465849 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004af675 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffe0 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffc9f65e99f R14: 00007fa874405300 R15: 0000000000022000 INFO: task syz-executor.0:7438 blocked for more than 140 seconds. Not tainted 4.19.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25656 7438 5922 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5181 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xbb/0x160 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xde/0x110 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x3c/0x40 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x180/0x1f0 fs/buffer.c:3178 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3204 __ext4_handle_dirty_metadata+0x17a/0x520 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4f8/0xc40 fs/ext4/inline.c:1240 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4960 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308 ksys_fallocate+0x3c/0x80 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x92/0xf0 fs/open.c:337 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465849 Code: Bad RIP value. RSP: 002b:00007f48dfdba188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465849 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004af675 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffe0 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007fffe43c213f R14: 00007f48dfdba300 R15: 0000000000022000 INFO: task syz-executor.3:7444 blocked for more than 140 seconds. Not tainted 4.19.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D25656 7444 5917 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5181 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xbb/0x160 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xde/0x110 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x3c/0x40 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x180/0x1f0 fs/buffer.c:3178 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3204 __ext4_handle_dirty_metadata+0x17a/0x520 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4f8/0xc40 fs/ext4/inline.c:1240 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4960 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308 ksys_fallocate+0x3c/0x80 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x92/0xf0 fs/open.c:337 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465849 Code: Bad RIP value. RSP: 002b:00007f4a2b0ad188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465849 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004af675 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffe0 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffc4a9240bf R14: 00007f4a2b0ad300 R15: 0000000000022000 INFO: task syz-executor.2:7452 blocked for more than 140 seconds. Not tainted 4.19.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D25656 7452 5914 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5181 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xbb/0x160 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xde/0x110 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x3c/0x40 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x180/0x1f0 fs/buffer.c:3178 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3204 __ext4_handle_dirty_metadata+0x17a/0x520 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4f8/0xc40 fs/ext4/inline.c:1240 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4960 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308 ksys_fallocate+0x3c/0x80 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x92/0xf0 fs/open.c:337 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465849 Code: Bad RIP value. RSP: 002b:00007f5145370188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465849 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004af675 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffe0 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffe50ef5def R14: 00007f5145370300 R15: 0000000000022000 INFO: task syz-executor.1:7458 blocked for more than 140 seconds. Not tainted 4.19.176-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25656 7458 5923 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5181 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xbb/0x160 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xde/0x110 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x3c/0x40 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x180/0x1f0 fs/buffer.c:3178 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3204 __ext4_handle_dirty_metadata+0x17a/0x520 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x4f8/0xc40 fs/ext4/inline.c:1240 ext4_convert_inline_data+0x299/0x3c0 fs/ext4/inline.c:2027 ext4_fallocate+0xdb/0x1920 fs/ext4/extents.c:4960 vfs_fallocate+0x2b5/0x7c0 fs/open.c:308 ksys_fallocate+0x3c/0x80 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x92/0xf0 fs/open.c:337 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465849 Code: Bad RIP value. RSP: 002b:00007f85ef078188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465849 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004af675 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffe0 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffc9266f6ff R14: 00007f85ef078300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1096: #0: 0000000089340ae4 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 1 lock held by in:imklog/5580: 2 locks held by syz-executor.4/7419: #0: 00000000d06ad0a4 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 00000000d06ad0a4 (sb_writers#3){.+.+}, at: vfs_fallocate+0x4df/0x7c0 fs/open.c:307 #1: 00000000eeaa0765 (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 00000000eeaa0765 (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x1dc/0x3c0 fs/ext4/inline.c:2025 2 locks held by syz-executor.5/7431: #0: 0000000002dc0f3b (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 0000000002dc0f3b (sb_writers#3){.+.+}, at: vfs_fallocate+0x4df/0x7c0 fs/open.c:307 #1: 0000000004154966 (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 0000000004154966 (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x1dc/0x3c0 fs/ext4/inline.c:2025 2 locks held by syz-executor.0/7438: #0: 00000000caec7641 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 00000000caec7641 (sb_writers#3){.+.+}, at: vfs_fallocate+0x4df/0x7c0 fs/open.c:307 #1: 0000000054297c9a (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 0000000054297c9a (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x1dc/0x3c0 fs/ext4/inline.c:2025 2 locks held by syz-executor.3/7444: #0: 0000000095938b66 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 0000000095938b66 (sb_writers#3){.+.+}, at: vfs_fallocate+0x4df/0x7c0 fs/open.c:307 #1: 000000007a1478e6 (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 000000007a1478e6 (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x1dc/0x3c0 fs/ext4/inline.c:2025 2 locks held by syz-executor.2/7452: #0: 00000000d90a4081 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 00000000d90a4081 (sb_writers#3){.+.+}, at: vfs_fallocate+0x4df/0x7c0 fs/open.c:307 #1: 000000002abbf7a1 (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 000000002abbf7a1 (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x1dc/0x3c0 fs/ext4/inline.c:2025 2 locks held by syz-executor.1/7458: #0: 000000008f3fa247 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000008f3fa247 (sb_writers#3){.+.+}, at: vfs_fallocate+0x4df/0x7c0 fs/open.c:307 #1: 000000006483a77b (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 000000006483a77b (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x1dc/0x3c0 fs/ext4/inline.c:2025 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1096 Comm: khungtaskd Not tainted 4.19.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf5/0x120 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7239 Comm: kworker/u4:6 Not tainted 4.19.176-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:1) RIP: 0010:mark_held_locks+0x0/0x130 kernel/locking/lockdep.c:2792 Code: e8 95 43 45 00 4c 8b 45 c0 48 8b 4d c8 48 8b 75 d0 e9 ef ee ff ff e8 5f 43 45 00 e9 9e f9 ff ff 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 8d 87 80 08 00 00 48 89 e5 48 89 c2 41 57 41 56 48 c1 ea 03 RSP: 0018:ffff8881d72e7370 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffff8881d71f8100 RCX: 1ffff1103ae3f13f RDX: 1ffff1103ae3f12e RSI: 0000000000000001 RDI: ffff8881d71f8100 RBP: ffff8881d72e7388 R08: ffff8881d71f89f8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86f92202 R13: ffffea0007261040 R14: ffffffff8179c544 R15: 0000000000000286 FS: 0000000000000000(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd506c860c8 CR3: 000000000866d001 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x28/0x190 kernel/trace/trace_preemptirq.c:30 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x82/0xd0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] __set_page_dirty_nobuffers+0x234/0x4b0 mm/page-writeback.c:2480 redirty_page_for_writepage+0x35/0x50 mm/page-writeback.c:2529 __block_write_full_page+0x524/0xc00 fs/buffer.c:1757 block_write_full_page+0x1b1/0x230 fs/buffer.c:2951 blkdev_writepage+0x13/0x20 fs/block_dev.c:581 __writepage+0x56/0xb0 mm/page-writeback.c:2305 write_cache_pages+0x5bc/0xf70 mm/page-writeback.c:2240 generic_writepages mm/page-writeback.c:2329 [inline] generic_writepages+0xca/0x130 mm/page-writeback.c:2318 blkdev_writepages+0x9/0x10 fs/block_dev.c:1980 do_writepages+0xca/0x240 mm/page-writeback.c:2344 __writeback_single_inode+0xc6/0xc40 fs/fs-writeback.c:1380 writeback_sb_inodes+0x47b/0xd40 fs/fs-writeback.c:1642 __writeback_inodes_wb+0xec/0x1e0 fs/fs-writeback.c:1711 wb_writeback+0x593/0x910 fs/fs-writeback.c:1817 wb_check_old_data_flush fs/fs-writeback.c:1919 [inline] wb_do_writeback fs/fs-writeback.c:1972 [inline] wb_workfn+0x887/0xec0 fs/fs-writeback.c:2001 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415